The fraught relationship between Russia and the West, which was supposed to improve following an agreement over Ukraine, has descended instead into renewed acrimony after a series of tense military and diplomatic confrontations.

A recent video shows a black man in Paris forcefully pushed off a subway train by rowdy British Chelsea fans headed for a match with Paris Saint-Germain. An investigation into their identities is underway.

British intelligence chiefs have threatened to halt their sharing of information with their German counterparts if Germany goes ahead with a parliamentary inquiry into British and US spying, according German media reports.